Windows 7: Moving 2nd partition onto deleted 1st partition?

I put 7100 on a second partition on my p.c. so I could test it out since I have had to revert to 7000 paritition on this machine on all builds after 7022 due to internet loss bug. However I have solved the problem and am now ready to move the second partition over onto the first one, which I have done before with Windows 7 since it has a hidden partition with its boot manager and so it doesn't rely on C: drive to boot.

Normally I would use Disk Management to delete the first partiition, then use Partition Magic Pro 9 to move the second partition over onto the first one's free space. It has worked several times so far, but the problem is that I am not sure I want to have as a long-term main partition one which is labeled "F." Is this going to be a problem somewhere down the line? I cannot find a way to change the drive letter on a primary system partition like this to letter "C" which is now available. Any suggestions or do I just need to clean install?

No problems will occur. You can change the drive letters by accessing Disk Management, right clicking on the "F" partition, and pressing "Change Drive Letter and Paths". If there is no "C" drive present or "C" has not already been assigned, then it should work.